Tension for loom shuttles



July 30, 1929. A, CEDERLUND 1,722,898

TENSION FOR LOOM SHUTTLES Filed Jan. 6, 1928 13 11 Ifa O 1,3 24

Patented July 30, 1929.

UNTEDY STATES PATENT OFFICE.

ALBERT CEDERLND, OF WORCESTER, MASSACHUSETTS, ASSGNOR TO CROIvIPTON 6c KNOWLES LOOM W'ORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION 0F MASSACHUSETTS.

TENSION FOR LOOM SHUTTLES.

Application led January 6', 1928.

rThis invention relates to improvements in tensioning mechanism for loom shuttles and it is the general object of the invention to provide a simpliiied self-threading eye for automatic weft Ichanging looms and operating to take up slack in the iilling and at the same time provide proper tension for the weft.

In the weaving of certain fabrics such as silk it is highly desirable that the weft tension be maintained uniformly inasmuch as the threads entering` into the finished cloth are so small that variation in the tension is readily perceptible. When the weft is silk, either nat- Vural or artificial, it is desirable to provide means for taking 'up any slack which may occur between the selvage and the shuttle when the loom beats up and it is an important object of my present invention to provide a selfthreading shuttle having an improved means for taking up a comparatively large amount of slack with a rather small motion on the part of the slack taking-.up device.

It is a further object of my present inven tion to provide a tubular guide for a light plunger which has projecting Vfrom opposite sides thereof weft engaging horns which act to equalize the strain on the plunger so that the latter may move easily and without unnecessary friction in the tube.

It is another object of my present invention to combine with the tube a relatively fixed finger around which the weft is looped by the horns moving with the plunger. y

N ith these and other objects in view which will appear as the description 1proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

In the accompanying drawings wherein I have shown a convenient embodiment of my invention, i

Fig. 1 is a top plan view of a shuttle having my invention applied thereto,

Fig. 2 is an enlarged top plan of the right hand end of Fig. 1 with certain parts in section and showing the parts in the position they assume during the second pick after transfer',

Fig. 3 is a view similar to Fig. 2 but with the parts moved to complete the threading operation,

Fig. l is an enlarged front elevation taken in the direction of arrow t, Fig, 1,

Serial No. 244,961.

Figs. 5 and 6 are vertical sections on lines 5 5 and 6 6, respectively, of Figs. Ll and 8, respectively, and

Fig. 7 is a vertical section similar' to Fig. 5, but showing only the tubular guide for the sliding plunger.

It is to be understood that the shuttle set forth herein may be used in connection with an automaticweft replenishing loom wherein a full bobbin is inserted into the shuttle at the magazine end of the loom, the shuttle being picked across to the remote side of the loom to partly thread the shuttle. In looms of this type the shuttle is not ordinarily completely threaded until the shuttle is being picked back toward the magazine side of the loom on the second pick following transfer'. The shuttle S has the usual springs 10 which receive the rings 11 on the butt 12 of the bobbin B. i

The shuttle may be lined with fur as at 13 to prevent unwinding of the weft W in conical layers. rThe shuttle is provided at the right hand end thereof as shown in Fig. l with an eye receiving chamber let and may have the end thereof provided with groove 15 in which the weft lies during the iirst piclr after the bobbin B is inserted into the shuttle S by transferring mechanism not shown.

The block E has front and rear walls 2O and 21, respectively, screws 22 passing through the shuttle and into the walls to hold the block in the chamber 14. Projecting rearwardly and toward the adjacent end of the shuttle is a threading finger 28, the rearmost portion of which may extend beyond the rear part of groove 15 a slight amount as shown in Figs. 2 and 3. The rear wall 21 maybe provided with a second threading linger 2e which is spaced somewhat from the linger 23 as shown in Fig. 5 to define with the latter a slot 25 through which the weft lV extends.

Extendingl upwardly from the bottom 26 of the eye is a post 27, see Fig. 5, spaced from the rear wall 21 to define a passage through which the thread passes.- A tubular guide 3() may be formed as part of the bottom 26 and has a bore 31 which has extending therefrom for a portion of its length slots 32 Vthrough which project weft engaging horns 33 and 34, respectively. As shown in Figs. l and t said horns both extend upwardly a. short distance above the top of the tubular element 30 and are then inclined upwardly and to the right toward the threading linger 23. There is one horn on each side of the tube and said horns are both supported by a light plunger 35 which is freely movable in the bore 3l. Said plunger is connected by means of a light spring 36 to a lever 37 as at 33 and said lever is pivoted to a pin 39, being held normally to the right as shown in F ig. 3 by an elastic d() which may be connected to the rearwardly extending arm il of the lever' 3'? and pass through a screw 42 extending vertically through the shuttle.

A threading arm d3 is secured to the tubular element 30 so as to lie between the horns 33 and when the parts are in the position shown in Fig. 2, said arm being inclined in a direction opposite to that in which the upper portions of the horns 33 and 34 extend and having the upper surface thereof inclined suciently so that a thread may rise therealong to pass to the left of said arm as viewed in Fig. 6.

lV hen a transfer of bobbins is to take place in the shuttle the newly inserted bobbin B will be passed into the shuttle by transfer mechanism not shown and the end l of the weft FV wound on the bobbin will extend to the right as shown in Fig. l, lying in the groove l5. n the iirst pick after transfer the thread will continue to assume the position shown in Figs. l and 4.-, but on the return pick when the shuttle is again moved toward the replenishing side of the loom the thread T will pass down a slot 50 defined between the iinger 23 and the bottom of the groove l5 and will pass into a slot 51 formed in the wall of the eye. rlhe thread is thus moved downwardly and will extend behind and slip below the bottom of the threading' finger 23 and will be located behind the post 27 as shown in Fig. 3. As the shuttle continues to move to the right on the second pick after transfer the end of the filling T will be held by the selvage on the side of the loom opposite the transfer mechanism and the weft will therefore assume the position shown in Fig. 3, passing over the tubular element 30 and being caught by both horns 33 and 34. Because of the post 27 the tension in the warp due to the flight of the shuttle will draw the light plunger 35 to the left or toward the bobbin against the action of the elastic and as this occurs the filling extending' between the horns will move up the inclined top surface of the arm 43 and eventually will slip behind said arm i3 and be caught thereunder. `When the shuttle arrives at the end of its right hand movement any slaclr which may occur in the filling will be talren up by the elastic a0, arm 3T moving to the right from the position shown in Fig. 2 to that shown in Fig. 3 to draw the horns and plunger away from the arm 43. rlhe thread of course being caught under the arm 43 and being held by the horns 33 and 34 will be given a sinu- Ous form to take up a considerable length of thread in a relatively small part of the shuttle. The block is lprovided with a delivery opening which may be of any approved form such as shown in Figs. 3, il and 5 so that the filling will ordinarily assume the position shown in Fig. 3 when the shuttle is at rest. The spring 36'is shown as a convenient means for establishing iiexible connection between the lever 37 and the plunger 35, but l do not wish to be limited to the use of a spring inasmuch as resilience in the connection between these twoparts isnot absolutely necessary. As clearly shown in Fig. 3 the strains placed on the plunger 35 by the horns 33 and 34 are operative on both sides of said plunger and therefore there is little tendency for the latter to cramp or stick in the bore 3l, movement of the plunger in the bore being free and unresisted because of the even distribution of the strains of said plunger due to the fact that the horns are located on opposite sides thereof.

From the foregoing' it will be seen that I have provided a simple shuttle wherein thread engaging horns on opposite sides of the plunger cooperate with a fixed arm so that movement of the plunger under influence ofthe elastic d() will tension the weft and take up any slack which may occur therein. It will further be seen that by having the horns 33 and 3l to extend on opposite sides of the plunger` the latter is relieved of lateral or twisting strains and is free to move with a minimum of resistance in the bore 4l.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what l claim is:

l. ln a shuttle having a longitudinally extending thread passage and a delivery eye located in the front wall thereof, means defining a tube located between the delivery eye and the thread passage, a plunger movable in the tube, a pair of thread engaging horns carried by and extending on opposite sides of the plunger and projecting through the tube, a fixed inclined thread engaging arm, said horns being inclined in a direction opposite to the inclination of the fixed arm, the thread extending around the horn and threading arm, and means to cause relative movement between the plunger and the iixed arm to tension the weft and take up any slack which may occur therein.

l 2. ln a shuttle having a longitudinally extending' thread passage and a delivery eye located in the front wall thereof, a plunger guided in the shuttle for movement in a direction substantially parallel to the length of the shuttle, a pair of horns mounted on opposite sides of the plunger inclined upwardly and toward the adjacent end of the shuttle,

a lixed thread engaging arm inclined upwardly and toward the center of the shuttle, said horns and arm being between the thread passage and the delivery eye, the thread extending around the horn and threading arm and means to cause movement oi the plunger and horns away from the tixed arm to tension the weft and take up any slack which may occur therein.

3. In a shuttle having a longitudinally extending thread passage and a delivery eye located in the front wall thereof, a plunger guided 'for movement in the direction of the length of the shuttle and located between the r thread passage and the delivery eye, a pair of spaced horns extending on opposite sides of the plunger and secured to the latter, said horns being inclined upwardly and toward the adjacent end oi' the shuttle, a threading arm located intermediate the horns and extending upwardly and toward the center of the shuttle, and means tending normally to hold the plunger and the horns away from the threading arm, the filling extending from the bobbin as it extends from the threaded position to the delivery eye moving the horns and plunger toward the threading arm and being moved up the latter to be engaged and held thereby as the resilient means moves the plunger away from the bobbin.

Ll. In a shuttle having a longitudinally extending thread passage and a delivery eye, a plunger mounted for movement in the shuttle in a direction substantially parallel to the length of the shuttle and located between the thread passage and the delivery eye, a horn extending from the plunger and inclined upwardly and toward the adjacent end ot the shuttle, a threading arm inclined upwardly and toward the center of the shuttle, and lixed relatively to the shuttle, the thread extending rom the thread passage around the horn and threading arm and toward the delivery eye, and resilient means to movesaid plunger and horn away from the arm.

In testimony whereof I have hereunto affixed my signature.

ALBERT CEDERLUND. 

